#include <stdio.h>

int main()
{
    int year;
    scanf("%d", &year);
    if ((year % 4 == 0 && year % 100 != 0) || year % 400 == 0)
    {
        printf("yes!!%d是闰年", year);
    }
    else
    {
        printf("No!!%d不是闰年", year);
    }
    return 0;
}